Chair



H. A. ATWODD.

Patented July 20, 1 920.

CHAIR.

APPLICATION FILED MAR. 23, 1920.

2 SHEETS-SHEET I.

mmuu H. A. ATWOOD,

CHAIR. APPLICATION FILED MAR. 23. 1920.

2 SHEETSSHEET\ 2.

Patented July 20, 1920.

' V HARRY A. n rwoon, or MILWAUKEE, WISCONSIN. l

CHAIR.

Application filed. March 23, 1920. 1 Serial No. 367,993.

To (ZZZ whom it may concern:

Be it known that I, HARRY A. A'rwoon, a

citizen of the United States,and resident of.

Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented new and useful Improvements in Chairs, of which the following is a description, reference being had to the accompanying which are a part ofthis specification.

My invention relates to certain new and useful improvements in chairs in. general, but refers more particularly to features of novelty and advantage in chairs with ad justably yielding backs, narily used by stenographers.

This invention has for one of its; objects 7 to provlde an improved manner of securing the usual cushion spring for the yielding back in position, so that the best-possible re sults are obtained and a structure provided which will be comparatively inexpensive of production.

Another object of the to provide a chair iron for, use with a chair of the type described, in which the amount of finishing work necessary after the same has been formed, preparatory to securing the same to a finished chair, is reduced to a minimum. I V r A further objec of this invention is to provide animproved form of chair back carrying member,having its inner end concealed withina recess seat supporting frame, and having means integral therewith cooperating with the cushion springto maintain same ata tension and thus yieldingly urge the back to its normal position. V

A still further object of the present in vention is to provide improved means for adjustably securing a back portion to the back staff, the back staff to the back staff supporting member, and means for limiting the movementof the back staff and its sup-v porting member under action of'the cushion sprmg. these and other purposes,

tures of the inventionare structure, economy in other salient feathe simplicity in With the above and other objects in View which will appear as the description proceeds my invention resides in the novel construction, combination parts substantially as hereinafter described Specification of Letters Patent.

drawings, 1

' bodying my invention,

such as are ordipresent invention is formed by the chair accompanying drawings,

Besides, the accomplishment of.

manufacture, accessij bility of achustable parts and a construction of. pleasing appearance.

and arrangement of- Patented J u 20, 1920.

In the accompanying drawings I have physical embodiment of my invention constructed according to the-best mode I- have so far devised forthe practical application ofthe principles thereof, and in which:

illustrated one complete example ofv the. I

Figure l is aside elevation of a-chair em--.

a portion of the supporting legs being broken away. Y

2 is a rearelevation of the upper por- 7 tion of theupright staff and back members adjustably carried thereby.

Fig. 3 is a fragmentary sectional view taken on the line 33 ofFig. 2. I Fig. 4; is a bottom plan view of the under,- side of the chair seat. V

Fig. is asectional view taken through the chair seat on the plane indicated by the line 5 5 of Fig. 4.

Fig. Gis a fragmentary the inner end of the back staifsupporting frame or arm, illustrating the manner of applying the tension of the cushion spring thereto to normally urge its outer end upwardly. r i

Fig. 7 is a erspective view of the im-. proved form 0 collar member I employ for connecting the outer end, of the cushion spring with the back staff supporting frame or arm, and

Fig. 8 is a frame or arm. V

Referring now more particularly to the it will be perceived that the improved chair comprises a suitable supporting base composed of a plurality. of legs 10,'an adjustable threaded vertical post or shaft 11, the position of which'may be top plan View of fragmentary perspective view I of the inner end of the back staff supporting regulated by an adjusting nut12 and .a'seat frame on-the top ofthe post having diverging forwardly extendingarms 13 fastened to the bottom of seat 14: and a pair of shorter diverging rearwardly. extending arms '15, likewise secured under the faceof the seat. 1 These seat supporting spiderarms are conaperture of which the upper end of the threaded shaft post 11 is fitted. As best shown in Figs. 1, 4: and 5, the seat .nected together beneath the middle of the :chairby a web or hub portion 16 into an supporting spider "is provided with a sub- 7 stantially central rectangular shaped spring receiving compartment 16 in which is projected the forward end bifurcated or forked to form side arm members 18 having two dependlng ears or lugs 19 aperturechas at 20, to receive a cross pin 21 having its ends secured in side wall portions 22 integral with the hub portion 16. The wall portions 22 define the spring compartment 16", and the cross pin 21 is secured therein justforwardly of the hub 16. i

The extreme upper inner ends of the arms 18 of the frame 17, are connected together by a yoke portion 23 having arounded projection 24 formed on its inner face at each end, for engagement with the inner sprlng collar 25 to be later described.

end of the frame 17 is provided with a central verticallye rtending lug or rib 26, en, gag'eable in a recess 27 formed in the lower 1 end of an upright back staff 28 secured thereto by fastenmg members 29. The rib 26 prevents lateral movement of the back staff and coact with the fastening members 29 to firmly secure the back staff to the frame 17. 7

As clearly shown in rigs. t and 5, the

front spider arms 13 are connected together by means of a transverse partition 30, provided with acentral aperture 31 through lugs 24- being which passes a tension or guide-bolt 32,

having its rear end passed between the arms 18 beneath the yoke 23. Mounted on the bolt 32 is a collar 33 retained from dislodgment therefrom by a head 34, and engaging the rear end of a cushion spring 35 coiled around the bolt 32 and having its forward end engaged with the collar member 25 which is slidably mounted 'upon the bolt 32.

The collar member 25 is formed with two.

lugs :or ear members 36 positioned one on each side of the aperture through which the bolt 32 passes, provided with notches or recesses 37, pivotally but readily detachably eugageable with the rounded lugs 21 of the yoke member 23.

The spring 35 is maintained under tension by means ofa handle ornut 38 in threaded adjusted engagement with the outer end of bolt 32, and by reason of the positioned above the pivot of the frame 17, will" at all; times yieldingly urge the outer end of the frame upwardly.

The handle or nut 38 is so positioned that the operator of the chair may readily adjust or regulate the spring 35 without shifting his or her positiomthe nut being positioned near the forward end of the chair seat.

The upward movement of the frame 17 under action of the spring '35 is adjustably limited by means of asubstantially vertically adjustable abutment or stop screw 39 of a fulcrumed frame or arm17. The arm 17 has its forward end The outer ened.

the tension of the spring 35 41, the screw 39 passing through an elongated aperture 12 in the arm 17. This adjusting screw 39 is carried by a rearwardly,

extending projection 43 formed on the hub 16 and is in threaded engagement with an aperture therein.

It will be readily understood that the adjustment of the screw 39 determines the forward limit of the travel of the seat back because the upper end or head 41 of the screw, performs the function of the adjustable abutment or stop, before the staff 28 is free'to swing rearwardly'from such position under the cushioning and yielding restraint, however, of the coil spring 35. Thus the degree of cushion spring action on the staff 28 may be determined or controlled by the han' dle nut 38 and the limit of forward swing of the staff regulated by screw 39.

' The backward swinging movement of the back is limited by theengagement of the frame 17 with the top of the hub 16. If derest 45 of any desired shape is vertically adjustably secured to the upper end of the back staff 28 by neans of a guide plate &6 secured to the back 15 and having side parallel flanges 47 providing a guide channel in which the upper end of the staff 28 passes. A binding or clamping bolt 48 passes through the upper end of the back staff and has its head passed through an elongated slot 49in the guide plate16 and has a clam'pingnut on its outer threaded end, the bolt 18 firmly binding the guide plate 46 against the staff The bolt 48 is readily disengageable from the back portion45 by raising the back portion its full upward limit of movement to register the enlarged end 19 of the guide slot with the' bolt head to permit its removal therefrom. This structure is easier 48when its nut 50 is tight to produce than structures now in every day 7 v use which contemplate the channeling or recessing of either'the back 45 or staff 28.

hat I claim as my invention is: 1. A chair iron comprising a seat portion supporting frame, a chair back supporting member having its inner end pivotally' connected to said supporting frame and its'outer end connected with projection on the inner end'of said chair;

connection with the supporting frame, a

a chair back portion, a 3 7 back supporting member above its pivotal I wardly of the pivot of said chair back supporting porting member, and a cushion spring having one end pressing against said projection and its other end pressing against the rear end of the tension rod.

2. A chair comprising a seat portion, a supporting frame secured thereto, a chair back portion, a chair back supporting memberhaving its inner end bifurcated to form two securing arms and its outer end connected with the back portion, means pivotally connecting the securing arms w'th the supporting frame, a guide and tension rod hav ing one end connected with the supporting frame and its other end disposed in the space between the securing arms above their pivots, a cushion spring mounted on the portion of said rod disposed between the securing arms, a collar member secured to the inner end of said rod and engaging the rear end of said spring, a second collar member slidably mounted on said rod intermediate its ends and engaging the forward end of said spring, and means connecting the second collar member with said securing arms whereby the cushion spring is confined between said collar members at a tension to normally urge the outer end of said back supporting member upwar dly.

3. A chair comprising a seat portion, a supporting frame secured thereto, a chair back portion, a chair back supporting member having its inner end bifurcated to form two securing arms andits outer end connected with the back portion, vmeans pivotally connecting the securing arms with the supframe, a guide and tension rod hav-' ing one end connected with the supporting frame and its other end disposed in the space between the securing arms above their pivots, a cushion spring mounted on the portion of said rod disposed between the securing arms, a collar member secured to the inner end of said rod and engaging the rear end of said spring, a second collar member slidably mounted on said rod intermediate its ends and engaging the forward end of said spring, a transverse member connecting the inner ends of said securing arms, and connections between the transverse member and the second collar member.

4:. A chair comprising a seat portion, a supporting frame secured thereto, a chair back portion, a chair back supporting member having its inner end bifurcated to form two securing arms and its outer end connected with the back portion, means pivotally connecting the securing arms with the supporting frame, a vguide and tension rod having one end connected with the supporting frame and its other end disposed in the space between the securing arms above their pivots, a cushion spring mounted on the portion of said rod disposed between the securing arms, a collar member secured to the inner end of said rod and engaging the rear end of said spring, a second collar member slidably mounted on said rod intermediate its ends and engaging the forward end of said spring, a transverse member connecting the innerends of said rounded lugs formed on said transverse member and forming a pivotal connection between the transverse member andsaid second collar member.

5. A chairiron comprising a seat portion frame, a chair back supporting supporting member having its inner end bifurcated and pivotally connected with the supporting frame andits outer. end connected with a chair back portion, a transverse portion connecting the bifurcated end of said member above its pivotal connection with the supporting frame, a projection carried by said transverse portion, 'a tension rod having one end, connected with said supporting frame and its other end passed beyond the pivotal connection of said chair back supporting portion with the supporting frame, a cushion spring, means connecting one end of said spring with the last mentioned end of said tension rod, and means pivotally connecting the otherend of the spring with said projection, said spring normally urging said securing arms, and

projection and last mentioned tension rod end apart to yieldingly urge the end of the supporting member connected with a chair back upwardly.

In testimony whereof, I affix my signature.

' HARRY A. ATWOOD. 

